Base portion for ink refill tank



FIG. 1 is a perspective view of a base portion for ink refill tankshowing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a right side elevational view thereof.

The broken line showings of an ink refill tank in the drawings are forillustrative purposes only and form no part of the claimed design.

The ornamental design for a base portion for ink refill tank, as shownand described.